Renovation cost calculator for Australia 2026
Working out what a renovation will actually cost in Australia is where most homeowners come unstuck. You get three quotes that are $60,000 apart, a builder who talks in "rough ballparks", and a Pinterest board that has no idea what tiling a bathroom in Sydney costs in 2026. A good renovation cost calculator cuts through that — it gives you a defensible number to plan around before a single tradie walks through the door.
This guide gives you a renovation cost calculator for Australia built on real per-square-metre rates, from a cosmetic refresh in Adelaide through to a full knock down rebuild on the Gold Coast. We'll show you the numbers, what actually drives them, and how to sanity-check any quote you're handed.
Want a fast number right now? The free builder renovation quote calculator gives you an instant ballpark in about 30 seconds — no signup, results are an indication only.
Last updated: July 2026.
Key takeaways
- A whole-home renovation in Australia runs roughly $800/m² for a cosmetic refresh up to $4,000/m² for a new extension in 2026, with knock down rebuilds around $3,200/m².
- Labour and approvals are the two lines homeowners underestimate most — a council DA and permits allowance alone commonly sits near $5,500.
- The cheapest lever is scope: keeping plumbing and walls where they are can halve a bathroom or kitchen budget.
- A live-in premium of around 15–20% applies when the builder has to work around you still living in the house.
- Any renovation cost calculator gives an indication only — your builder confirms the real price after a site inspection.
What this guide covers
- How much does a renovation cost in Australia in 2026
- What drives your renovation budget
- Knock down rebuild vs renovate
- How to use a renovation cost calculator
- City-by-city differences
- How to sanity-check a builder's quote
- Frequently asked questions
How much does a renovation cost in Australia in 2026 {#how-much}
A renovation in Australia costs roughly $800 to $4,000 per square metre in 2026, depending on how deep you go. A cosmetic refresh — paint, flooring, new fixtures, no structural change — sits at the bottom. A new extension or a high-end multi-room remodel sits at the top.
The table below is a home renovation cost calculator in table form. The per-m² rates are the current default rates built into Leadkit's builder renovation calculator, which Australian tradies use to quote real jobs.
| Renovation type | Indicative rate per m² | Example project | Ballpark total (ex approvals) |
|---|---|---|---|
| Cosmetic refresh (paint, floors, fixtures) | ~$800 | Freshen a 100 m² home | $40,000–$90,000 |
| Single-room reno (kitchen or bathroom) | ~$3,000 | 12–15 m² room | $18,000–$45,000 |
| Multi-room / whole-floor remodel | ~$2,500 | 60 m² of living space | $80,000–$180,000 |
| Extension / addition | ~$4,000 | 30 m² room addition | $120,000–$200,000+ |
| Knock down rebuild | ~$3,200 | 200 m² new home | $350,000–$700,000+ |
On top of the build itself, budget around $5,500 for a council Development Application (DA) and permits, and 5–15% of the build cost for an architect or designer if your project needs one. Prices are typically quoted inclusive of GST for residential work.
Methodology: these ranges are anchored to the current NSW-based default rates inside Leadkit's builder renovation calculator — Leadkit's own tool, not neutral third-party data. Across the renovation quotes generated through it, the two lines homeowners underestimate most are approvals and the live-in premium. For independent cost benchmarks, the Housing Industry Association (HIA) and Master Builders Australia both publish building cost data.
This is a price indication only. Your tradie will confirm the final price after assessing the job.
What drives your renovation budget {#drivers}
The single biggest driver of any renovation budget is whether you move plumbing, walls or the roofline. Keep the wet areas and structure where they are, and you're renovating. Move them, and you're building.
A few terms worth knowing before you read a quote:
- PC and PS sums — Prime Cost and Provisional Sum items. These are allowances for things not yet chosen (tiles, tapware, appliances). If your quote is full of PC sums, the "total" is soft and can blow out once you pick finishes.
- DA vs CDC — a Development Application goes to council and can take weeks; a Complying Development Certificate (CDC) is a faster private-certifier path for straightforward jobs. Which one you need affects both time and the ~$5,500 approvals line.
- Live-in premium — builders typically add 15–20% when you stay in the house during works, because they lose time protecting rooms, working in stages and cleaning down each day.
Materials matter too. A kitchen with Caroma tapware, a stone benchtop and Bosch appliances costs far more than a Bunnings flat-pack with laminate. Colorbond roofing, James Hardie cladding and Dulux paint systems are the kind of brand-level choices that quietly move a number by tens of thousands.
Rough rule of thumb: labour is usually 35–50% of a renovation, so the trades you hire matter as much as the tiles you pick. For a room-by-room view, our bathroom renovation cost guide for Sydney breaks the labour lines down in detail.
Knock down rebuild vs renovate {#knockdown}
A knock down rebuild costs around $3,200 per square metre in 2026 for a project-home build, which often works out cheaper per m² than a heavy multi-room renovation once you factor in the compromises of working around an old structure. That surprises people.
The maths is simple with a knock down rebuild cost calculator: multiply your new home's floor area by the rate, then add demolition (commonly $20,000–$40,000), approvals and any site costs like sloping blocks or rock. A 200 m² rebuild at $3,200/m² is roughly $640,000 for the build alone.
Renovating wins when the existing home is structurally sound and you love the bones of it. A rebuild wins when the place is tired throughout, the layout fights you, or a renovation would cost 70%+ of a new build anyway. If you're weighing a bigger footprint instead, compare against our house extension cost guide for Australia.
One thing to check before you commit: your block's zoning and any heritage or overlay controls. NSW Fair Trading (or your state equivalent — VBA in Victoria, QBCC in Queensland) is the right place to confirm licensing and contract requirements for a build of this size.
How to use a renovation cost calculator {#how-to-use}
A renovation budget calculator works best when you feed it honest numbers. Here's the quick version:
- Measure the area in square metres — just the rooms or floor area you're touching, not the whole house.
- Pick the renovation type — cosmetic, single room, multi-room, extension or rebuild. This sets the per-m² rate.
- Add approvals — assume a DA allowance unless your builder confirms a CDC applies.
- Flag if you're living in so the 15–20% premium is included.
- Sanity-check against real quotes — a calculator gets you a defensible planning number, not a fixed price.
Get your free renovation ballpark: run the numbers through a renovation calculator before you brief a builder — 30 seconds, no signup, indication only.
If your project is really a single room, the dedicated kitchen renovation calculator and bathroom renovation calculator give tighter numbers because they use room-specific rates.
City-by-city differences {#cities}
Where you renovate changes the number more than most people expect. Sydney and the Gold Coast run hottest; Adelaide and Perth generally come in lower for the same scope.
- Sydney — the most expensive metro for renovations, driven by labour rates and tighter council processes. Expect the top of every range.
- Melbourne — close behind Sydney, with strong demand for skilled trades.
- Brisbane and the Gold Coast — rising fast, especially for extensions and rebuilds on Queenslander-style homes.
- Perth and Adelaide — typically 10–20% cheaper than Sydney for equivalent work.
Trade availability is the hidden variable. The Australian Bureau of Statistics (ABS) tracks construction cost movements, and in tight labour markets a good builder's premium can outweigh the raw material savings of a cheaper city. Browse the full construction and building calculator range to price individual trades in your area.
How to sanity-check a builder's quote {#sanity-check}
The fastest way to sanity-check a quote is to divide the total by the floor area and compare the result to the per-m² rates above. If a builder quotes $150,000 to renovate 40 m² of kitchen and living, that's $3,750/m² — high for a multi-room job, so ask what's driving it.
Watch for three things:
- Too many PC sums — a low headline price stuffed with provisional allowances will climb once you choose finishes.
- No approvals line — if the DA or permits aren't itemised, the "total" isn't a total.
- A quote that's suspiciously low — in Australia a written quote is legally binding, so a cheap fixed quote either has tight scope or a variation trap waiting.
Always confirm the builder's licence and insurance. For anything over your state's threshold, home building compensation cover (formerly home warranty insurance) is usually mandatory — NSW Fair Trading and the equivalent bodies interstate explain who needs it.
Frequently asked questions {#faqs}
Q: How accurate is a renovation cost calculator in Australia?
A: A renovation cost calculator gives you a reliable planning ballpark, usually within 10–20% of real quotes when you feed it honest square metres and the right renovation type. It's not a fixed price — it can't see your site, your soil, or the condition behind your walls. Use it to set a budget, filter unrealistic quotes and know roughly what to expect before you call a builder. Then get at least three written quotes and let the tradie confirm the final figure after a site visit. A whole-home builder renovation calculator is a good starting point before you compare them.
Q: How much does a full house renovation cost in 2026?
A: A full house renovation in Australia costs roughly $2,500 to $4,000 per square metre in 2026 for a multi-room or whole-home job, so a 150 m² home lands somewhere between $200,000 and $450,000 depending on finish level and city. Cosmetic-only refreshes come in far lower, around $800/m². The biggest swing factors are how much plumbing and structure you move, the quality of finishes, and whether you're living in during the works. Approvals and an architect can add another $10,000–$40,000 on bigger projects.
Q: Is it cheaper to renovate or knock down and rebuild?
A: It's often cheaper to renovate if the home is structurally sound, but a knock down rebuild at around $3,200/m² can beat a heavy renovation once you add the cost of working around an old structure. The rule of thumb: if your renovation quote reaches 70% or more of a new build, a rebuild usually gives better value and a better result. A knock down rebuild also resets everything — wiring, plumbing, insulation and energy rating — which a renovation can't fully do. A knock down rebuild cost calculator makes the comparison easy: price both scenarios at their per-m² rate and see which wins.
Q: What's the biggest hidden cost in a renovation?
A: Approvals and the "live-in premium" are the two costs homeowners forget most. A council DA and permits allowance commonly sits near $5,500, and builders typically add 15–20% when they have to work around you living in the house. Other hidden costs include asbestos removal in pre-1990 homes, rewiring to current standards, waterproofing failures found once tiles come off, and provisional sums that were set too low. Always keep a 10–15% contingency on top of your quoted price.
Q: Do I need council approval to renovate?
A: It depends on scope. Cosmetic work — paint, flooring, new kitchen in the same footprint — usually needs no council approval. Structural changes, extensions, moving plumbing or altering the roofline generally need either a Development Application (DA) through council or a faster Complying Development Certificate (CDC) via a private certifier. Your builder or a building certifier will tell you which path applies. Check the requirements with your state consumer body such as NSW Fair Trading before signing a contract.
Q: How much should I budget for a kitchen or bathroom renovation?
A: Budget around $3,000 per square metre for a single-room kitchen or bathroom renovation, so a typical 12–15 m² room lands between $18,000 and $45,000 in 2026. Keeping the plumbing and layout where they are is the single biggest saving. Premium finishes — stone benchtops, imported tiles, freestanding baths — push you to the top of the range. A room-specific tool gives a tighter estimate than a whole-home one; our Melbourne kitchen renovation cost guide breaks the numbers down further.
Final tips
Get your planning number first, then your quotes. A renovation cost calculator for Australia gives you the confidence to spot a rip-off, hold a builder to a realistic scope, and know your project is affordable before you fall in love with it. Keep a 10–15% contingency, itemise every PC sum, and never treat a headline figure as final until a licensed builder has seen the site.
Want an instant renovation price estimate? Browse the free Leadkit calculator library and pick the tool that fits your job — takes 30 seconds, no signup. Results are an indication only; your tradie confirms the final price after assessing the job.
Run a trade business and want to capture leads like this from your own site? Start free — embed a smart quote calculator in 60 seconds and turn browsers into booked jobs.